User guide

September 2009
OmniSwitch 6400/6850/6855/9000/9000E------ Release 6.4.2.R01 Page 35 of 79
• Ping, traceroute
• DNS client using Authority records
• Telnetv6 - Client and server
• File Transfer Protocol (FTPv6) – Client and server
• SSHv6 – Client and Server
IP DoS Filtering
By default, the switch filters the following denial of service (DoS) attacks, which are security attacks
aimed at devices that are available on a private network or the Internet:
• ARP Flood Attack
• Invalid IP Attack
• Multicast IP and MAC Address Mismatch
• Ping Overload
• Packets with loopback source IP address
IP Multicast Switching (IPMS)
IP Multicast Switching is a one-to-many communication technique employed by emerging applications
such as video distribution, news feeds, conferencing, netcasting, and resource discovery (OSPF, RIP2,
and BOOTP). Unlike unicast, which sends one packet per destination, multicast sends one packet to all
devices in any subnetwork that has at least one device requesting the multicast traffic. Multicast
switching also requires much less bandwidth than unicast techniques and broadcast techniques since
the source hosts only send one data stream to the ports on which destination hosts that request it are
attached.
Destination hosts signal their intent to receive a specific multicast stream by sending a request to do so
to a nearby switch using Internet Group Management Protocol (IGMP). The switch then learns on
which ports multicast group subscribers are attached and can intelligently deliver traffic only to the
respective ports. This mechanism is often referred to as IGMP snooping (or IGMP gleaning). Alcatel-
Lucent’s implementation of IGMP snooping is called IP Multicast Switching (IPMS). IPMS allows
switches to efficiently deliver multicast traffic in hardware at wire speed.
Both IGMP version 3 (IGMPv3), which handles forwarding by source IP address and IP multicast
destination, and IGMP version 2 (IGMPv2), which handles forwarding by IP multicast destination
address only, are supported.
IP Multicast Switching (IPMS) - Proxying
IP multicast proxying and configuring the IGMP and MLD unsolicited report interval are available
with this implementation of IPMS. Proxying enables the aggregation of IGMP and MLD group
membership information and the reduction in reporting queriers. The unsolicited report interval refers
to the time period in which to proxy any changed IGMP membership state.
IP Multinetting
IP multinetting allows multiple subnets to coexist within the same VLAN domain. This
implementation of the multinetting feature allows for the configuration of up to eight IP interfaces per
a single VLAN. Each interface is configured with a different subnet.